If you are thinking of opening an account in Zerodha then you can open it by clicking on this link. Click on the link given below to open an account in Zerodha
When you click on the link a new page will open. Where as soon as you verify the mobile number, the process of opening an account in Zerodha will start.
To open an account in Zerodha, a charge of Rs 200 has to be paid. Talking about Zerodha account opening document, to open an account you should have Aadhar card, PAN card, Aadhar and bank registered mobile number, bank account and income proof (bank statement, canceled cheque).
I have already written a post on the step by step account opening process in Zerodha. I have given the link of that post below, so you can open an account in Zerodha by reading that post.